<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- form 表单 -->
    <form action="hello.html">
        <!-- input 标签 -->
        <!-- 按钮 -->
        <input type="button" value="这是一个按钮"><br/>
        <!-- 输入框 -->
        <input type="text" placeholder="请输入昵称" name="username"><br/>
        <!-- 单选框 -->
        <input type="radio" name="gender" value="1">男<br/>
        <input type="radio" name="gender" value="2">女<br/>
        <input type="radio" name="gender" value="3">保密<br/>
        <!-- 复选框 -->
        <input type="checkbox">篮球
        <input type="checkbox">排球
        <input type="checkbox">学习<br/>
        <!-- 密码框 -->
        <input type="password" name="password">
        <!-- 提交按钮 -->
        <input type="submit" value="提交">
    </form>
    <select name="" id="">
        <option selected="selected">北京</option>
        <option value="">上海</option>
        <option value="">廊坊</option>
        <option value="">大厂</option>
        <option value="">香河</option>
    </select><br/>
    <textarea rows="3" cols="50">

    </textarea>

</body>
</html>